CN219675676U - Concrete axial strain measuring device - Google Patents
Concrete axial strain measuring device Download PDFInfo
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- CN219675676U CN219675676U CN202322079860.6U CN202322079860U CN219675676U CN 219675676 U CN219675676 U CN 219675676U CN 202322079860 U CN202322079860 U CN 202322079860U CN 219675676 U CN219675676 U CN 219675676U
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Abstract
The utility model relates to the technical field of stress strain measurement, in particular to a concrete axial strain measurement device. The device comprises a plurality of frame structures sleeved on the periphery of a concrete member, wherein the frame structures are fixed with the side surfaces of the concrete member through clamping devices; the device also comprises a displacement sensor, wherein the displacement sensor is axially connected with a plurality of frame structures along the concrete member, one end of the displacement sensor is in abutting connection with the lowest frame structure, and the other end of the displacement sensor is fixedly connected with the rest frame structures so as to avoid the influence of the stability of the loading device on the accuracy of measured data; the clamping device comprises a clamping plate and a top plate, wherein the clamping plate is abutted against the side face of the concrete member, the top plate is connected with the clamping plate through a spring, the clamping device is connected with the frame structure in a penetrating mode through a horizontal column body, one end of the horizontal column body sequentially penetrates through the side face of the frame structure and the top plate, and is fixedly connected with the clamping plate, so that when a crack occurs, the clamping force is continuously provided through spring compression potential energy, and the device is prevented from falling off.
Description
Technical Field
The utility model relates to the technical field of stress strain measurement, in particular to a concrete axial strain measurement device.
Background
The concrete compressive stress strain full curve is an important content of nonlinear design and analysis of a concrete structure. In construction and infrastructure engineering, understanding the stress-strain characteristics of concrete in a pressurized state is critical to design and safety assessment. Measuring the compressive stress strain of concrete requires the use of a range of specialized techniques and equipment.
The measurement of stress is typically performed using force sensors, whereas the collection of strain is relatively difficult. One of the common measuring methods is to use strain gauges, which are attached to or embedded in the interior of a concrete structure to measure the strain of the concrete. The strain gauge can sense the tiny deformation of the concrete and convert the tiny deformation into an electric signal to be output. These electrical signals, after amplification and processing, can be used to calculate the strain of the concrete. The strain gauges may take different forms, such as resistive strain gauges, fiber optic strain gauges, etc., with the specific choice depending on the accuracy of the measurement and the environmental conditions.
The development of sensors plays an important role in the scientific field. With advances in technology and increasing demand, sensor technology has undergone a number of important stages of development. The displacement sensor is a device for measuring the position or displacement change of an object and is widely applied to the fields of industrial automation, mechanical engineering, aerospace and the like. The displacement sensor and the special measuring device are matched to be applied to concrete strain measurement, and the device has the advantages that the device can be continuously and repeatedly used in the follow-up process, CN217237445U discloses a concrete stress strain testing device, but a displacement meter is connected with a loading device, the stability of the operation of the loading device can influence the accuracy of the measuring data of the displacement meter, for example, in the test process, the loading device can slide with a concrete member, and the accuracy of the measuring data of the displacement meter connected to the loading device is reduced.
Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The utility model aims to provide a concrete axial strain measuring device which solves or alleviates the problems in the prior art.
In order to achieve the above object, the present utility model provides the following technical solutions:
the measuring device comprises a plurality of frame structures sleeved on the periphery of a concrete member along an axial spacing, wherein the frame structures are fixed with the side surfaces of the concrete member through a plurality of clamping devices, and the clamping devices are distributed along the circumferential direction of the frame structures;
the measuring device further comprises a displacement sensor, wherein the displacement sensor is axially connected with the plurality of frame structures along the concrete member, one end of the displacement sensor is in abutting connection with the lowest frame structure, and the other end of the displacement sensor is fixedly connected with the rest frame structures;
the clamping device comprises a clamping plate and a top plate, wherein the clamping plate is abutted against the side face of the concrete member, the top plate is connected with the clamping plate through a spring, the clamping device is connected with the frame structure in a penetrating mode through a horizontal column body which is perpendicular to the direction of the plate face of the clamping plate, and one end of the horizontal column body sequentially penetrates through the side face of the frame structure and the top plate and is fixedly connected with the clamping plate.
In one concrete axial strain measuring device as described above, preferably, the plurality of clamping devices are symmetrically distributed along the circumferential direction of the frame structure.
In the concrete axial strain measuring device, the horizontal column is preferably connected with the side surface of the frame structure in a penetrating way through a linear bearing.
In the concrete axial strain measuring apparatus as described above, preferably, the clamping plate is disposed in parallel with the top plate in a direction perpendicular to the side surface of the concrete member.
The clamping device further comprises a locking bolt which is perpendicular to the side face of the concrete member, the locking bolt is in threaded connection with the side face of the frame structure, and one end of the locking bolt penetrates through the side face of the frame structure to vertically abut against the top plate.
According to the concrete axial strain measuring device, preferably, the measuring device further comprises a plurality of stand columns, the stand columns are axially connected with the plurality of frame structures along the concrete member, one ends of the stand columns are fixedly connected with the lowest frame structure, the other ends of the stand columns are connected with the rest frame structures in a penetrating manner, and the plurality of stand columns are circumferentially distributed along the frame structures.
In the concrete axial strain measuring device, preferably, the clamping device is abutted with the middle part of the side surface of the concrete member, and the displacement sensor is positioned at the middle part of the side surface of the concrete member.
In the concrete axial strain measuring device, preferably, the frame structure has the same number of sides as the concrete members, each side of the frame structure is provided with a set of clamping devices which are abutted against the middle parts of the sides of the corresponding concrete members, and each side of the frame structure is provided with a set of displacement sensors which are positioned at the middle parts of the sides of the concrete members.
In a concrete axial strain measuring device as described above, preferably each side of the frame structure is the same distance from the side of the corresponding concrete member.
The concrete axial strain measuring device according to any one of the above, preferably, the frame structure extends out of the side plate, the displacement sensor is axially connected with the side plates of the plurality of frame structures along the concrete member, one end of the displacement sensor is in abutting connection with the side plate of the lowest frame structure, and the other end of the displacement sensor is fixedly connected with the side plates of the rest frame structures.
Compared with the closest prior art, the technical scheme of the embodiment of the utility model has the following beneficial effects:
the displacement sensor and the loading device are arranged separately, so that the influence of stability during the pressurizing operation of the loading device on the accuracy of measurement data is avoided; on one hand, the frame structure and the clamping device are matched to lock the side face of the concrete member so as to reduce the influence on the accuracy of the measurement data of the displacement sensor caused by the transverse deformation of the concrete member in a pressed state;
in addition, concrete is used as a brittle material, and when being axially pressed, the concrete can generate longitudinal or oblique cracks. When the bolt is adopted to provide clamping force, cracks appear at the contact part with the bolt, so that the bolt can slide, and meanwhile, when the bolt is screwed down only by a screw, the position of the bolt is fixed, and at the moment, the pretightening force provided by the bolt only can fail due to the fact that the pretightening force cannot be applied to a concrete member, so that the whole measuring device fails. When the spring force is used for providing the pretightening force, the pretightening force is used as a flexible pretightening force, after the crack appears, the spring pressed between the top plate and the clamping plate can be always attached to the side surface of the concrete member along with the transverse deformation of the concrete member and the development of the crack under the driving of compression potential energy, and enough compression quantity is reserved in advance so as to ensure that the measuring device cannot fall off and continuously provide radial clamping force for the concrete member.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. Wherein:
FIG. 1 is a schematic view of a concrete axial strain measurement device according to some embodiments of the present utility model;
FIG. 2 is a top view of a concrete axial strain measurement device provided in accordance with some embodiments of the present utility model;
fig. 3 is a schematic diagram illustrating the operation of a clamping device according to some embodiments of the present utility model.
Reference numerals illustrate:
1. a concrete member; 2. an upper square frame structure; 3. a horizontal column; 4. a linear bearing; 5. a locking bolt; 6. a cap nut; 7. a column; 8. a lower square frame structure; 9. a displacement sensor; 10. a side plate; 11. ear plates; 12. a top plate; 13. a clamping plate; 14. and (3) a spring.
Detailed Description
The utility model will be described in detail below with reference to the drawings in connection with embodiments. The examples are provided by way of explanation of the utility model and not limitation of the utility model. Indeed, it will be apparent to those skilled in the art that modifications and variations can be made in the present utility model without departing from the scope or spirit of the utility model. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield still a further embodiment. Accordingly, it is intended that the present utility model encompass such modifications and variations as fall within the scope of the appended claims and their equivalents.
In the following description, the terms "first/second/third" are used merely to distinguish between similar objects and do not represent a particular ordering of the objects, it being understood that the "first/second/third" may be interchanged with a particular order or precedence where allowed, to enable embodiments of the utility model described herein to be implemented in other than those illustrated or described herein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing embodiments of the present disclosure only and is not intended to be limiting of the present disclosure.
In the description of the present utility model, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present utility model and do not require that the present utility model must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. The terms "coupled," "connected," and "configured" as used herein are to be construed broadly and may be, for example, fixedly connected or detachably connected; can be directly connected or indirectly connected through an intermediate component; either a wired electrical connection, a radio connection or a wireless communication signal connection, the specific meaning of which terms will be understood by those of ordinary skill in the art as the case may be.
A concrete axial strain measuring apparatus according to the present utility model will be described in further detail with reference to fig. 1 to 3.
The measuring device comprises a plurality of frame structures sleeved on the periphery of the concrete member 1 along the axial spacing, wherein the frame structures are fixed with the side surface of the concrete member 1 through a plurality of clamping devices, and the clamping devices are distributed along the circumferential direction of the frame structures;
the measuring device further comprises a displacement sensor 9, the displacement sensor 9 is axially connected with a plurality of frame structures along the concrete member 1, one end of the displacement sensor 9 is in abutting connection with the lowest frame structure, and the other end of the displacement sensor 9 is fixedly connected with the rest of the frame structures.
The displacement of the measuring device is converted into displacement data through a voltage or current signal obtained by a displacement sensor, and the strain calculation is carried out by epsilon= delta L/L, wherein L is the distance between the middle wires of the clamping plates of the upper and lower frame structures, and delta L is the variation corresponding to the displacement sensor; the strain of the concrete should be calculated as an average of four or two displacement sensors.
The utility model adopts a plurality of frame structures sleeved on the periphery of the concrete member 1 along the axial direction at intervals and is matched with the clamping devices distributed along the circumferential direction of the frame structures so as to reduce the influence of the transverse deformation and cracks of the concrete member 1 on the measuring device, in particular to realize the axial deformation and the transverse deformation of the concrete member 1 in an axial compression state, the cracks appear on the surface of the concrete member 1, the relative positions of the frame structures and the concrete member 1 can be kept stable without inclining along with the transverse deformation and the crack development based on the matching of the clamping devices, and therefore, the axial movement of the displacement sensor 9 connected with the frame structures is not influenced, so that the accurate measurement of the strain data of the concrete member 1 in the compression state is realized.
In addition, concrete is used as a brittle material, and when being axially pressed, the concrete can generate longitudinal or oblique cracks. When the bolt is used for providing the clamping force, cracks appear at the contact part with the bolt, so that the bolt can slide, and meanwhile, when the bolt is screwed down only, the position of the bolt is fixed, and at the moment, the pretightening force provided by the bolt only can fail because the pretightening force cannot be applied to the concrete member 1, so that the whole measuring device fails. When the spring 14 is used for providing the pretightening force, the pretightening force is used as a flexible pretightening force, after a crack appears, the spring 14 pressed between the top plate 12 and the clamping plate 13 can be always stuck to the side surface of the concrete member 1 along with the dislocation and sliding of the concrete member 1 under the driving of compression potential energy, and enough compression quantity is reserved in advance so as to ensure that the measuring device cannot fall off and continuously provide radial clamping force for the concrete member 1.
In the specific embodiment of the utility model, the whole measuring device is made of light materials such as aluminum alloy and the like so as to reduce the influence of the measuring dead weight on the connection stability of the frame structure and the concrete member 1 and the accuracy of the measuring data of the displacement sensor 9.
The clamping device comprises a clamping plate 13 which is abutted against the side surface of the concrete member 1, and a top plate 12 which is connected with the clamping plate 13 through a spring 14, wherein the clamping device is connected with the frame structure in a penetrating way through a horizontal column 3 which is arranged along the direction perpendicular to the plate surface of the clamping plate 13, and one end of the horizontal column 3 sequentially penetrates through the side surface of the frame structure and the top plate 12 and is fixedly connected with the clamping plate 13;
by moving the position of the top plate 12 on the horizontal column 3, the clamping force applied by the clamping plate 13 to the concrete element 1 is adjusted.
In the specific embodiment of the utility model, the clamping plate 13 and the top plate 12 are arranged between the side surface of the frame structure and the side surface of the concrete member 1, the horizontal column 3 and the springs 14 are arranged in the middle of two ends of one side of the clamping plate 13 far away from the concrete member 1 along the direction perpendicular to the plate surface of the clamping plate 13, wherein the pair of springs 14 are respectively sleeved at the parts of the corresponding pair of horizontal columns 3 between the clamping plate 13 and the top plate 12, the pair of horizontal columns 3 sequentially penetrate through the top plate 12 and the side surface of the frame structure along the direction far away from the clamping plate 13 and extend to the outside of the frame structure, and the position change of the top plate 12 on the horizontal column 3 can be transmitted to the clamping plate 13 through the springs 14 so as to drive the clamping plate 13 to move along the direction perpendicular to the plate surface of the clamping plate 13 under the penetrating connection effect of the side surface of the horizontal column 3 and the frame structure.
In other embodiments of the present utility model, the springs 14 are disposed between the corresponding pair of horizontal columns 3, and two ends of the springs 14 are respectively clamped and fixed with the top plate 12 and the clamping plate 13.
The clamping devices are symmetrically distributed along the circumferential direction of the frame structure.
When the measuring device is installed, firstly, the top plate 12 of a pair of clamping devices symmetrically arranged in the circumferential direction of the frame structure is moved along the direction close to the side surface of the concrete member 1, then the corresponding clamping plates 13 are driven to move until the clamping plates 13 of the pair of clamping devices are abutted against the side surface of the concrete member 1, then the top plate 12 is further moved until the top plate 12 is abutted against the clamping plates 13, the stable connection between the frame structure and the concrete member 1 is realized, then the rest clamping devices are operated according to the steps, so that the operation pressure of a single pair of clamping devices is reduced, a certain distance is kept between the top plate 12 and the clamping plates 13 of all the clamping devices, and a part of adjustment allowance is reserved for the radial clamping force applied by the clamping devices.
In order to reduce the loss generated by the movement of the horizontal column 3 in the direction perpendicular to the plate surface of the clamping plate 13 and the friction resistance born by the horizontal column 3, the horizontal column 3 is connected with the side surface of the frame structure in a penetrating way through the linear bearing 4.
In order to uniformly apply the clamping force to the side surface of the concrete member 1, the clamping plates 13 and the top plate 12 are arranged in parallel along the direction perpendicular to the side surface of the concrete member 1, specifically, the plate surfaces of the clamping plates 13 and the top plate 12 are kept parallel to the corresponding side surface of the concrete member 1, the horizontal columns 3 and the springs 14 are arranged along the direction perpendicular to the plate surfaces of the clamping plates 13, the top plate 12 and the corresponding side surface of the concrete member 1, and when the measuring device is used, the plate surfaces of the clamping plates 13 are completely abutted to the corresponding side surface of the concrete member 1, and compared with the tightening only by screws, the radial pressure can be prevented from being excessively large, so that cracks are generated.
The clamping device further comprises a locking bolt 5 which is perpendicular to the side surface of the concrete member 1, the locking bolt 5 is in threaded connection with the side surface of the frame structure, and one end of the locking bolt 5 penetrates through the side surface of the frame structure to vertically abut against the top plate 12;
by rotating the lock bolt 5, the position of the top plate 12 on the horizontal cylinder 3 is adjusted.
In the specific example of the utility model, one end of the locking bolt 5 passes through the side surface of the frame structure and vertically abuts against the center position of the plate surface of the top plate 12, the locking bolt 5 is positioned at the middle position of the pair of horizontal columns 3, the position of the top plate 12 on the horizontal columns 3 can be adjusted by rotating the locking bolt 5 and matching with the elastic force of the springs 14, and then the compression amount of the springs 14 positioned between the clamping plate 13 and the top plate 12 is changed, so that the radial clamping force applied to the side surface of the concrete member 1 by the clamping device through the elastic force of the springs 14 is finally adjusted.
In order to accurately measure strain data under the condition that the concrete member 1 is axially pressed, the measuring device further comprises a plurality of stand columns 7, the stand columns 7 are axially connected with a plurality of frame structures along the concrete member 1, one ends of the stand columns 7 are fixedly connected with the lowest frame structure, the other ends of the stand columns 7 are connected with other frame structures in a penetrating mode, the plurality of stand columns 7 are circumferentially distributed along the frame structures, the concrete member 1 can only be axially pressed and deformed under the guiding action of the stand columns 7, and when the stand columns 7 are removed, eccentricity generated after the concrete is pressed can be measured.
In order to further realize accurate measurement of strain data under the axial compression state of the concrete member 1, a clamping device is arranged to be abutted against the middle of the side surface of the concrete member 1, a displacement sensor 9 is positioned at the middle position of the side surface of the concrete member 1, specifically, the center of the plate surface of a clamping plate 13 of the clamping device is positioned on the center line of the corresponding side surface of the concrete member 1 along the axial direction, and the displacement sensor 9 measures the compression deformation data of the middle position of the concrete member 1.
The frame structure is provided with the same number of side surfaces as the concrete members 1, each side surface of the frame structure is provided with a set of clamping devices which are abutted with the middle parts of the corresponding side surfaces of the concrete members 1, and each side surface of the frame structure is provided with a set of displacement sensors 9 which are positioned at the middle parts of the side surfaces of the concrete members 1.
In the concrete embodiment of the utility model, the concrete member 1 is a prismatic test block with the size of 100mm multiplied by 300mm or a prismatic test block with the size of 150mm multiplied by 300mm, the corresponding frame structure is two square frame structures with four sides, the four sides of the two square frame structures are in one-to-one correspondence with the four sides of the concrete member 1, and the four sides of the two square frame structures are sleeved on the periphery of the concrete member 1 from top to bottom along the axial direction of the concrete member 1; correspondingly, four sets of clamping devices and four sets of displacement sensors 9 are respectively arranged on four sides of the directional frame structure, and in the actual use process, strain data of the concrete member 1 in an axial compression state are obtained through the average value of measurement results of the four sets of displacement sensors 9.
The four vertex angles of the square frame structure extend out of the corresponding four lug plates 11 in the direction far away from the concrete member 1, the upright posts 7 are arranged at the positions of the four lug plates 11 along the circumferential direction of the square frame structure, one ends of the upright posts 7 are connected with the lug plates 11 of the upper square frame structure 2 in a penetrating way, and the other ends of the upright posts 7 are fixedly connected with the lug plates 11 of the lower square frame structure 8 through cap nuts 6;
each side of the frame structure is at the same distance from the corresponding side of the concrete element 1.
In the specific embodiment of the utility model, the square frame structure is a square frame structure, two square frame structures are coaxially arranged with the concrete member 1, and four sides of the square frame structure are the same as the corresponding four sides of the concrete member 1, so that radial clamping force applied to the concrete member 1 by the clamping devices on the four sides of the square frame structure can be uniformly adjusted.
The frame structure extends outwards to form a side plate 10, the displacement sensor 9 is axially connected with the side plates 10 of the plurality of frame structures along the concrete member 1, one end of the displacement sensor 9 is in abutting connection with the side plate 10 of the lowest frame structure, and the other end of the displacement sensor 9 is fixedly connected with the side plates 10 of the rest frame structures.
In the specific embodiment of the utility model, the middle positions of the four side surfaces of the square frame structure extend outwards from the side surface of the concrete member 1 along the direction away from the side surface of the concrete member 1, one end of the displacement sensor 9 penetrates through the side plate 10 of the upper square frame structure 2 and is matched with a bolt through a butterfly nut to be fixedly connected with the side plate 10, and the other end of the displacement sensor 9 is in abutting connection with the side plate 10 of the lower square frame structure 8.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The concrete axial strain measuring device is characterized by comprising a plurality of frame structures sleeved on the periphery of a concrete member along an axial spacing, wherein the frame structures are fixed with the side surfaces of the concrete member through a plurality of clamping devices, and the clamping devices are distributed along the circumferential direction of the frame structures;
the measuring device further comprises a displacement sensor, wherein the displacement sensor is axially connected with the plurality of frame structures along the concrete member, one end of the displacement sensor is in abutting connection with the lowest frame structure, and the other end of the displacement sensor is fixedly connected with the rest frame structures;
the clamping device comprises a clamping plate and a top plate, wherein the clamping plate is abutted against the side face of the concrete member, the top plate is connected with the clamping plate through a spring, the clamping device is connected with the frame structure in a penetrating mode through a horizontal column body which is perpendicular to the direction of the plate face of the clamping plate, and one end of the horizontal column body sequentially penetrates through the side face of the frame structure and the top plate and is fixedly connected with the clamping plate.
2. A concrete axial strain measuring apparatus as claimed in claim 1 wherein the plurality of clamping means are symmetrically distributed along the circumference of the frame structure.
3. A concrete axial strain measuring apparatus as claimed in claim 1 wherein the horizontal column is connected to the side of the frame structure by linear bearings.
4. A concrete axial strain measuring apparatus as claimed in claim 1 wherein the clamping plates are disposed parallel to the top plate in a direction perpendicular to the sides of the concrete member.
5. The concrete axial strain measuring apparatus of claim 4 wherein the clamping means further comprises a lock bolt disposed perpendicular to the side of the concrete member, the lock bolt being threadably connected to the side of the frame structure, one end of the lock bolt passing through the side of the frame structure and abutting the top plate perpendicularly.
6. The concrete axial strain measuring device of claim 1, further comprising a plurality of posts, wherein the posts are axially connected to the plurality of frame structures along the concrete member, one end of each post is fixedly connected to the lowermost frame structure, the other end of each post is connected to the rest of the frame structures in a penetrating manner, and the plurality of posts are circumferentially distributed along the frame structures.
7. A concrete axial strain measuring apparatus as claimed in claim 1 wherein the clamping means abuts a central portion of the side of the concrete member, and the displacement sensor is located at a central portion of the side of the concrete member.
8. A concrete axial strain measuring apparatus as claimed in claim 7 wherein the frame structure has the same number of sides as the concrete member, each side of the frame structure being provided with a set of clamping means for abutting a central portion of the corresponding side of the concrete member, each side of the frame structure being provided with a set of displacement sensors located at a central portion of the side of the concrete member.
9. A concrete axial strain measuring apparatus as claimed in claim 8 wherein each side of the frame structure is equidistant from the side of the corresponding concrete member.
10. A concrete axial strain measuring apparatus according to any one of claims 1 to 9 wherein the frame structures extend outwardly from the side plates, the displacement sensor is axially connected to the side plates of the plurality of frame structures along the concrete member, one end of the displacement sensor is in abutting connection with the side plate of the lowermost frame structure, and the other end of the displacement sensor is fixedly connected to the side plates of the remaining frame structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322079860.6U CN219675676U (en) | 2023-08-04 | 2023-08-04 | Concrete axial strain measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322079860.6U CN219675676U (en) | 2023-08-04 | 2023-08-04 | Concrete axial strain measuring device |
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| CN219675676U true CN219675676U (en) | 2023-09-12 |
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| CN202322079860.6U Active CN219675676U (en) | 2023-08-04 | 2023-08-04 | Concrete axial strain measuring device |
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